"Russia's crypto-businessman Dmitry Marinichev's virtual currencies mining farm operates in a former Soviet-era car factory warehouse in Moscow, July 26, 2017. ""The form of currency we are used to is about to disappear,"" predicts Dmitry Marinichev in the deafening hum of hundreds of computers stacked on shelves hard at work mining for crypto money. Individuals, or firms like Marinichev's, provide the computing power to run the so-called blockchain which records the world's virtual money transactions. In return for providing that service they receive virtual money, of which bitcoin is the most popular, as payment -- a process bitcoiners call ""mining"". / AFP PHOTO / MAXIM ZMEYEV / TO GO WITH AFP STORY BY Maxime POPOV        (Photo credit should read MAXIM ZMEYEV/AFP/Getty Images)"
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